Part discontinued Aster 26" Diffuser Assembly - make my own?

Had my roof repaired and I think they dropped something on my filter, started leaking at the top bulkhead of the sidemount. Two years ago I replaced the laterals but now when trying to order the diffuser assembly it's nowhere to be found. It's a simple l-shaped PVC - anyone have experience making their own replacement parts? Seems like it should be simple enough if I take the pipe into Lowe's or Home Depot. No pool store in town will touch it ... but they will all sale me a new filter.